Authorized Lennox dealer. Family-owned since 2009. Don't freeze, call D's…
Lennox Commercial HVAC Sales & Service in Chicago
When a commercial HVAC system goes down, it's not just uncomfortable, it's a business problem. D's Air & Heating installs, repairs, and services commercial HVAC equipment for property owners and facility managers across Chicago and the surrounding suburbs, working as a family-owned, authorized Lennox dealer since 2009. From rooftop units to VRF systems, our EPA certified technicians work on the same Lennox commercial product line we're trained and certified on, for businesses that can't afford to guess.
Authorized Lennox dealer (also Carrier & Green authorized)
Family-Owned Since 2009
EPA Certified Technicians
4.8★ Google Rating · 90+ Reviews
What Our Customers Say
See why our neighbors keep calling us back. Book Online and find out for yourself.
What Sets Us Apart
Commercial accounts have different priorities than a single-family home: uptime, budget, and a dealer who doesn't disappear after the install. Here's what we bring to that.
Authorized Lennox dealer.
Our authorized status covers Lennox's commercial product line in addition to residential, plus authorization for Carrier and Green equipment, so your building's system is backed by the same manufacturer support a homeowner gets.
Family-owned since 2009.
We've operated as a family business in Chicago and the surrounding suburbs for more than fifteen years, working with property owners directly instead of through a subcontractor network.
EPA certified technicians.
Every technician on our team is EPA certified, which is required for the refrigerant handling involved in commercial system work.
4.8 stars, 53 Google reviews.
Our rating reflects both residential and commercial customers, pulled directly from Google.
The same member benefits, extended to commercial accounts.
A maintenance agreement gets your business the same discounted service, priority scheduling, and member-only benefits our residential customers receive.
Want to talk through your building's specific setup? Book a free estimate or call 773-940-0965.
Gas Piping
New gas lines for ranges, fireplaces, and outdoor kitchens, installed to code by a licensed plumber who handles the permitting details.
Tank and tankless water heater installation and replacement, with a plain-language comparison so you know exactly what you're choosing.
Water Heater Installation
Central air and ductless mini-split installation, repair, and service, built to get you through a Chicago summer.
Air Conditioners
Our Commercial HVAC Services
Six ways we keep commercial properties comfortable, all under one authorized Lennox dealer.
Gas Piping
New gas lines for ranges, fireplaces, and outdoor kitchens, installed to code by a licensed plumber who handles the permitting details.
Tank and tankless water heater installation and replacement, with a plain-language comparison so you know exactly what you're choosing.
Water Heater Installation
Rooftop Units
The workhorse of most commercial buildings, and the first thing worth checking when comfort complaints start coming in. We install, repair, and service Lennox rooftop units sized to your building's actual load.
Variable Refrigerant Flow (VRF) Systems
Different tenants, different zones, different comfort needs. Lennox VRF systems let us give each part of your building its own control without running separate systems for each one.
Commercial Mini-Split & Split Systems
Not every commercial space needs full rooftop or VRF scale. For smaller offices, retail spaces, and additions, we install Lennox commercial mini-split and split systems sized to fit.
Commercial Controls
Managing comfort across multiple zones or units by hand gets complicated fast. We install Lennox commercial control systems that put that management in one place.
Commercial Indoor Air Quality
Air quality complaints from employees or tenants usually trace back to ventilation or humidity, not just temperature. We install Lennox commercial air quality equipment that addresses both.
Unit Heaters
Warehouses, garages, and industrial spaces need heating that can handle an open, high-ceiling area. We install and service Lennox unit heaters built for exactly that.
Gas Piping
New gas lines for ranges, fireplaces, and outdoor kitchens, installed to code by a licensed plumber who handles the permitting details.
Tank and tankless water heater installation and replacement, with a plain-language comparison so you know exactly what you're choosing.
Water Heater Installation
Central air and ductless mini-split installation, repair, and service, built to get you through a Chicago summer.
Air Conditioners
The often-overlooked half of your system, installed and maintained by the same technicians handling everything else.
Air Handlers
Not sure which of these fits your building? Contact us and we'll help you figure it out.
Why an Authorized Lennox dealer Matters
Commercial HVAC decisions carry more weight than a single-system replacement, and the dealer behind the equipment matters just as much on a rooftop unit as it does on a furnace. We hold the same authorized Lennox dealer status for commercial equipment that we do for residential, which means our commercial installs are backed by direct manufacturer training and support, not a workaround. Read more on our Lennox dealer advantage page.
Have a multi-building account or a property management company to loop in?
Contact us and we'll walk through it together.
Serving Chicago and the Surrounding Suburbs
We work with property owners and facility managers throughout Chicago and the surrounding suburbs, including Cicero, Berwyn, Oak Park, and Bensenville. Browse our service area.
Managing a property outside that list?
Ask us directly or
book online and we'll confirm coverage.
Commercial HVAC Cost, Service & Emergency FAQ
Is D's Air & Heating an authorized Lennox dealer for commercial buildings?
Yes. Our authorized Lennox dealer status covers commercial equipment in addition to residential, and we're also authorized for Carrier and Green commercial products. We've served Chicago-area businesses and homeowners since 2009. Learn more about our Lennox dealer status.
Do you work on both residential and commercial HVAC systems?
Yes. We install, repair, and service HVAC equipment for homeowners and for commercial property owners, all under the same authorized Lennox dealer status. If you manage both a home and a commercial property, we can handle both. Contact us to talk through your specific properties.
Why does my building have uneven temperatures from room to room or floor to floor?
This is usually a zoning issue, either a single system trying to cover too many different spaces, or controls that aren't set up to manage them independently. A VRF system or updated commercial controls often solves it. Contact us and we'll take a look at your building's layout.
What's the difference between a rooftop unit and a VRF system?
A rooftop unit is a single packaged system that heats and cools an entire space, while a VRF system lets different zones run independently, which matters more in buildings with multiple tenants or mixed-use spaces. The right choice depends on your building's layout and how it's used. Book a free estimate and we'll help you decide.
How fast can you respond if our HVAC goes down during business hours?
We treat commercial HVAC failures as the emergencies they are, since downtime affects your business, not just comfort. Call us or book online and we'll prioritize getting a technician out.
Do you offer financing or maintenance agreements for commercial accounts?
Yes. Commercial accounts can join our maintenance agreement for 15% off service and priority scheduling, and financing is available for larger installations. See maintenance agreement details.
How much does commercial HVAC installation cost?
Cost depends heavily on the type of system, the size of your building, and what's already in place, so it varies more than a typical residential estimate. We'll walk your property and give you an itemized estimate before any work begins. Book your free estimate.
Have a question specific to your property? Reach out or call 773-940-0965.
Don't freeze, call D's… Keep your business, tenants, or property comfortable year-round. Book a commercial HVAC consultation online, or call 773-940-0965.